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Steel and Composite Structures Volume 21, Number 6, August30 2016 , pages 1369-1388 DOI: https://doi.org/10.12989/scs.2016.21.6.1369 |
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Performance-based evaluation of strap-braced cold-formed steel frames using incremental dynamic analysis |
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M.R. Davani, S. Hatami and A. Zare
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| Abstract | ||
| This study is an effort to clearly recognize the seismic damages occurred in strap-braced cold formed steel frames. In order to serve this purpose, a detailed investigation was conducted on 9 full scale strap-braced CFS walls and the required data were derived from the results of the experiments. As a consequence, quantitative and qualitative damage indices have been proposed in three seismic performance levels. Moreover, in order to assess seismic performance of the strap- braced CFS frames, a total of 8 models categorized into three types are utilized. Based on the experimental results, structural characteristics are calculated and all frames have been modeled as single degree of freedom systems. Incremental dynamic analysis using OPENSEES software is utilized to calculate seismic demand of the strap-braced CFS walls. Finally, fragility curves are calculated based on three damage limit states proposed by this paper. The results showed that the use of cladding and other elements, which contribute positively to the lateral stiffness and strength, increase the efficiency of strap-braced CFS walls in seismic events. | ||
| Key Words | ||
| performance-based; cold formed steel frame; strap braced; seismic; incremental dynamic analysis (IDA); fragility curve | ||
| Address | ||
| Department of Civil Engineering, Yasouj University, Yasouj, Iran. | ||